摘要
基于潜水完整井非稳定流理论及砂土体渗透运移临界水力梯度作用机理,分析了松散含水砂层下浅埋煤层开采过程中顶板涌水水流动力场特征,并按砂体运移溃入工作面的启动、发展及终止三步探讨潜水水动力条件的作用机理。提出了浅埋煤层开采过程中上覆松散潜水含水砂层涌水溃砂形成的临界水头及其计算公式。并以神府矿区柠条塔煤矿S1103潜埋工作面为例,计算得出该工作面上覆松散潜水含水砂层形成溃砂的临界水头高度为1.92 m,为该工作面顶板溃砂防治提供理论依据。
Base on phreatic completely penetrating well unsteady flow theory and the mechanism ofcritical hydraulic gradient of sand infiltration and transportation, analyzed the seepage characteristics ofroof water inrush and discussed the mechanism action of hydrodynamic condition on sand particlestransportation and inrush during shallow seam mining under unconsolidated sand aquifer. Deducted thecalculation formula of roof water-sand inrush critical water head of shallow seam mining underloosening phreatic sand aquifer. Take S1103 long-wall workface of Ningtiaota coal mine as an example,the calculated critical water head is 1.92 m of water-sand inrush by using the formula mentionedabove. The result provides a theoretical base for the water-sand inrush prevention measures of theworkface.
出处
《煤炭技术》
CAS
2018年第2期219-222,共4页
Coal Technology
基金
中煤科工集团西安研究院有限公司基金项目(2014ZD014)
关键词
松散含水砂层
潜水完整井
浅埋煤层
涌水溃砂
临界水头
loose sand aquifer
phreatic completely penetrating well
shallow seam
water-sand inrush
critical water head
